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Model CAUA
Gas-Fired, Indoor, Vertical (Upflow)
Power-Vented Heater
INSTALLATION FORM RZ 405 (Version B)
Obsoletes Form RGM 405 (Version A)
APPLIES TO: Installation
Table of Contents
Installation and Operation ........................... Paragraphs 1-18 .... Pages 1-18
Optional Accessories ................................ Paragraphs 19-21 .. Pages 19-21
Check Installation and Start-Up ........................ Paragraph 22 .. Pages 22-23
Index By Page No. Index By Page No. Index
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requirements, check with the local gas company or any other local GENERAL (Cont'd) agencies who might have requirements concerning this installation. Separated-combustion units are designed to separate the air for com- Before beginning, make preparations for necessary supplies, tools, and bustion and the flue products from the environment of the building in manpower. which the unit is installed. Separated-combustion appliances are rec- Shipped-Separate Accessories ommended for use in dust laden
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6. Dimensions Figure 1 - Dimensions of Model CAUA ! Right Side " Top View View # &' # $ ( & '
) * -. / # 2 ' $ 0 0 0 " 1 " 1 0 0 0 0 0 * % + $ ,
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7. Venting and Combustion Air concentric adapter combustion air/vent system. Flue products must WARNING: The vent must be installed in always be vented to the outdoors. accordance with national and local regulations. Installation should be done by a qualified agency in accordance with these instructions. The qualified service agency installing the vent or Failure to provide proper venting could result in vent/combustion air system is responsible for the installation. death, serious injury and/or
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7A. Venting and Combustion Air Requirements for Separated-Combustion Installation (must use either Option CC2 or CC6) Specific Requirements (read all before installing) Comply with the specific requirements and instructions in the following paragraphs and illustrations. 1. Combustion Air Inlet Figure 2 - Attach Combustion Air Pipe Venter Diameter is 5" for Sizes 150 and 200 and 6" for Sizes 250, 300, Outlet 350, and 400. Use tin snips Use tin snips or aviation shears to cut out the hole in the t
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7. Venting and Combustion Air (cont'd) 7A. Venting and Combustion Air Requirements for Separated-Combustion Installation (must use either Option CC2 or CC6) (cont'd) either tape suitable for 550°F (such as Option FA1, P/N 98266) or 4. Pipe Diameter and Length high-temperature (450°F) silicone sealant. Maximum Pipe Length from Heater to Concentric Adapter - If using Category III vent pipe, follow the pipe manufacturer's in- minimum length is five feet (1524mm) structions for joining pipe sectio
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Minimum Clearances for Vent
, $- 5A Termination Location (all 3 S tructure ' directions unless specified) 3 . Forced air inlet within 10 ft 3 ft (0.9m) above (3.1m) Combustion air inlet of 6 ft (1.8m) 3 another appliance % %1 Door, window, or gravity air 4 ft (1.2m) horizontally inlet (any building opening) 4 ft (1.2m) below 1 ft (30cm) above Electric meter, gas meter * 4 ft
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7. Venting and Combustion Air (cont'd) 7A. Venting and Combustion Air Requirements for Separated-Combustion Installation (must use either Option CC2 or CC6) (cont'd) Figure 5D - Installation of a Typical Separated- 5 4 - To p 85 Combustion Unit with Horizontal Vent and Combustion View Air Pipes (Option CC6) , @ < 3 , 6 , " ) 2 +0' / !-% - A %
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2c) Attach the outside portion of the com- 6B "X" is the length of combustion air 6A bustion air pipe to the box. Determine pipe required through and above the length of the combustion air pipe so the roof 22" that dimension "X" (Figure 6A) is equal "X" must equal roof thickness (559mm) to the roof thickness, plus snow depth plus clearance required for
minimum and ridge or parapet clearance, but does anticipated snow
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7. Venting and Combustion Air (cont'd) 7B. Venting and Combustion Air Requirements for Power Vent Drawing Combustion Air from THE INSIDE SPACE and Venting Flue Products to the Outdoors (vent cap is required) If the environment has a positive pressure and is such that it is Figure 8 - Alternate not detrimental to combustion air, this system may be installed. Vent in any Vent Directions To provide combustion air to the heater sufficient air must enter position above the equipment location to repla
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heater manufacturer (Option CC1) or a field-supplied cap. If the vent cap is 5) Condensation ® field-supplied, use a Type L Breidert Air-x-hauster or equivalent vent cap. Any length of single-wall vent pipe exposed to cold air or run ® (Type L Air-x-hauster is a trademark of The G. C. Breidert Company.) Use through an unheated area or an area with an ambient temperature of a vent cap supplied by the pipe manufacturer is not permitted; the vent of 45°F or less must be insulated along its entire l
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The cut edges of the metal will be sharp. 8. Duct Connections and If installing an optional filter or filter/mixing cabinet shipped with the Ductwork heater, attach the cabinet at the "cutout" opening (See Optional Acces- sories, Paragraph 18 or 19). Depending on the cabinet and how it is Both inlet air ductwork and supply air discharge ductwork are required installed, the inlet opening may be horizontal or vertical. unless the heater is equipped with an optional inlet base and/or an optional di
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" ( 6 (
% 9. Gas Piping and Pressures ( E %
1 1* % :?& WARNING: This appliance is equipped for a 3
maximum gas supply pressure of 1/2 pound, 8 ounces, or 14 inches water column. Supply pressure higher than 1/2 pound requires & " installation of an additional lockup-type service ( "@ G regulator external to the unit. "
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Figure 14 - Burner Condensate Drain Connection 9. Gas Piping and Pressures (cont'd) Manifold Pressure Settings (cont'd) (supply) pressure must be within the specified range for the gas being used both when the heater is in operation and on standby. Incorrect inlet pressure could cause excessive mani- fold gas pressure immediately or at some future time. !!!!! Hex Locknut (silver) Instructions to Check Manifold Pressure (when unit is operating): —Burner Bottom Pan— 1) With the manual valve posi
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Figure 15 - Control Locations / A (<& $ . 3% % 1 1 A1 % * % %% % %
%% 3 " &
/ 1 &% & & &% * % 6 %% % %%
%% 3 14. Blower Motor and Drive 13. Combustion Air Proving Model CAUA units are equipped
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motor specifications. At final adjustment, amperes should not ex- 14. Blower Motor and Drive ceed motor nameplate amp rating. The installation must be ad- (cont'd) justed to obtain a temperature rise within the range specified on the heater rating plate. Adjusting Blower Speed Full Load Amps - Blower Motors (Open) The blower speed may be adjusted to achieve the desired outlet tem- HP 1/4 1/3 1/2 3/4 1 1-1/2 2 3 5 perature, as long as the adjustment is within the temperature rise and the static p
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TYPICAL WIRING DIAGRAMS Figure 17 - Typical Wiring Diagram for Model CAUA with Direct-Drive Blower Motor(s) $&
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TYPICAL WIRING DIAGRAMS (cont'd) Figure 18 - Typical Wiring Diagram for Models CAUA with Belt-Drive Blower Motor $&
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OPTIONAL ACCESSORIES 17. Optional Cased Cooling Coil, Model ACUA, ACUB, or ACUC This cased cooling coil is designed for use with the Model CAUA upflow heater. It is shipped separately for field installation over the discharge opening of the heater. Before installing, verify that the coil cabinet is the same size as the heater cabinet. Follow the installation instructions shipped with the cooling coil (Installation Form RZ 405-CC), the wiring diagram, and the instructions provided by the compress
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OPTIONAL ACCESSORIES (cont'd) 18. Optional Filter Cabinet (return air only) A filter cabinet designed for 2" pleated disposable or permanent metal filters is shipped separately for field assembly and installation. Depending on the option selected, filters are either shipped with the cabinet or are field-supplied. To adapt to a variety of applications, the heater cabinet is designed so that the filter cabinet can attach on either the right side, the left side, or the rear of the heater. The large
